Coffee filter



FIG. 1 is a perspective view embodying the ornamental design constituting my invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right-side view thereof,

FIG. 5 is a left side view thereof;

FIG. 6 is a plan view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for a coffee filter, as shown and described. 